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Pectinator spekii is the only representative of a genus not far
removed from Ctenodactyiu s ;  it is a smallish Rodent, 6 inches in

length, exclusive of a rather bushy tail nearly 3 inches long.
It comes from Abyssinia. It has somewhat the appearance of a
Squirrel, which is heightened i*y the fact that when sitting the
tail is arched over the back ; when running the tall Is carried out
straight. There are only four toes visible exLernally on both fore-
aBc! hind-limbs, but- pollex and hallux exist la the skeleton, with
a single phalanx each. There is only a single pair of mammae^
arid in correspondence with this but two or three young are
produced at a time. The hind-feet have bristles very much like
those of Gtenodactylus* The molars, however, are -J-. There are
twelve rlbs7 of which six reach the sternum. The latter is made
up of six pieces, and the manubrium in its breadth anteriorly
suggests that of the Vizcaehas. The clavicles are present-1

Fam* 21               —-This family, -which includes the Cavies and

FIG. 240,—Carpineho.     Hydrocho&rus capybcvra*      x 5^,
the Gapybara, is entirely South American and "West Indian in dis-
tribution.     It embraces animals of fair to large size, the Capybara
1 Peters, Trans. Zool. BOG. vii. 1871, p, S97»